window.zoo
From zoo v1.7-10
by Achim Zeileis
Extract/Replacing the Time Windows of Objects
Methods for extracting time windows
of "zoo"
objects and replacing it.
- Keywords
- ts
Usage
## S3 method for class 'zoo':
window(x, index. = index(x), start = NULL, end = NULL, ...)
## S3 method for class 'zoo':
window(x, index. = index(x), start = NULL, end = NULL, ...) <- value
Arguments
- x
- an object.
- index.
- the index/time window which should be extracted.
- start
- an index/time value. Only the indexes in
index
which are greater or equal tostart
are used. If the index class supports comparisons to character variables, as does"Date"
class,"yearmon"
c - end
- an index/time value. Only the indexes in
index
which are lower or equal toend
are used. Similar comments about character variables mentioned understart
apply here too. - value
- a suitable value object for use with
window(x)
. - ...
- currently not used.
Value
- Either the time window of the object is extracted (and hence return a
"zoo"
object) or it is replaced.
See Also
Examples
## zoo example
x.date <- as.Date(paste(2003, rep(1:4, 4:1), seq(1,19,2), sep = "-"))
x <- zoo(matrix(rnorm(20), ncol = 2), x.date)
x
window(x, start = as.Date("2003-02-01"), end = as.Date("2003-03-01"))
window(x, index = x.date[1:6], start = as.Date("2003-02-01"))
window(x, index = x.date[c(4, 8, 10)])
window(x, index = x.date[c(4, 8, 10)]) <- matrix(1:6, ncol = 2)
x
## for classes that support comparisons with "character" variables
## start and end may be "character".
window(x, start = "2003-02-01")
## zooreg example (with plain numeric index)
z <- zooreg(rnorm(10), start = 2000, freq = 4)
window(z, start = 2001.75)
window(z, start = c(2001, 4))
## replace data at times of d0 which are in dn
d1 <- d0 <- zoo(1:10) + 100
dn <- - head(d0, 4)
window(d1, time(dn)) <- coredata(dn)
Community examples
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